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I
strongly recommend using heat shrink tubing to protect the
antenna's soldiered connections from being ripped apart. The
LMR 400 cable is very rigid. Since it can not flex much it
can not absorb physical abuse and your point of soldier may
fail. Shrink tubing is a special type of material (you can
find it at Radio Shack) which will shrink when exposed to
heat generated by a heat gun or a gas torch.
Prior
to soldiering your "N" connector, dress the cable
and the copper pipe with heat shrink tubing. Mount and soldier
the connector and then shrink the tubing so it wraps tightly
over the pipe and the cable. The other piece should cover
the connector and the cable right next to it.
If
you don't have a heat gun you can use the propane torch but
have to be carefull not to burn the cable and the shrink wrap.
Test it on a small area first.
Fig. 8 Heat shrink tubing
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